Flash: Transmission Control Module (TCM) Updates
Jeep technical service bulletin 21-019-20 for 2020 Jeep Grand Cherokee.
- Bulletin number
- 21-019-20
- Component
- Electrical system
- Summary
- Flash: Transmission Control Module (TCM) Updates This bulletin involves reprogramming the TCM with the latest available software. The customer may notice one or more of the following conditions:A loud whistle noise upon engine start up. Rough and/or erratic transmission shifting between gears during normal drive cycles.
Owners of these vehicles have filed 74 complaints in the electrical category.
Vehicles covered
- Jeep Grand Cherokee 2020 2020
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